Electrically-welded pipe-joint



mo Model.)

A. H. & I. 0. MATATALL. ELBGT RIGALLY WELDED PIPE JOINT.

No. 569,836 Patented Oct. 20, 1396.

WITNESSES: INVENTORS:

M W m a Q BY WANTS.

VNITED STATES PATENT OFFICE.

ALBERT H. MATATALL AND IRA C. MATATALL, OF HARRISON, NElV JERSEY.

ELECTRlCALLY-WELDED PIPE-JOINT.

SPECIFICATION forming part of Letters Patent No. 569,836, dated October 20, 1896. Application filed Au ust 26, 1895- Serial No. 560,485. (No model.)

To to whom it may concern: wires g and insulated clamps or jaws a Z), all Be it known that we, ALBERT H. MATATALL in the manner common in electrical welding. and IRA C. MATATALL, citizens of Canada, Heretofore pipe ends have, before the proresiding at Harrison, in the county of Hudson cessional step of electrical welding, been 5 5 and State of New Jersey, have invented cerreamed out interiorly and beveled eXteriorly, tain new and useful Improvements in Electhe operation giving a shape to the end of trically-l'Velded Pipe-Joints; and We do herethe pipe in longitudinal section. Thus by declare the following to be a full, clear, formed, when end pressure was brought to and exact description of the invention, such bear upon the plastic or semifl uid extremities 60 as will enable others skilledin the art to which of the metal pipes, the normal movement of it appertain's to make and use the same, refthe said plastic metal is both inward and out erence being had to the accompanying drawward, as will be obvious. To prevent the re -ings, and to letters of reference marked thereduction of the pipe-passage, what has been on, which form a part of this specification. termed a core has been inserted in the pipe 65 This invention relates more particularly to and this has limited the inward movement; that class of pipe connections the unions or but the use of core-pieces, mandrels, and the joints of which are formed by electrical celike have entailed frequent losses in that the mentation or welding; and it consists in the pipes to be united have been of varying diprocess of uniting or welding metallic pipes, ameters, and, when first manufactured and 70 substantially as will be hereinafter set forth, because of imperfections in the pipe-making and finally embraced in the claim. machinery, have been provided with interior Referring to the accompanying drawings, ribs bosses, &c., requiring that the pipes be in which like letters of reference indicate corfirst bored out before inserting the core; but responding parts in each of the views, Figure even under ordinary and favorable and the 75 2 5 1 is a plan of an electrical Welding-machine, most constant conditions it was quite necessuch as is commonly employed. Fig. 2 is a sary and essential for the core to be smaller sectional View of abutting pipe-sections in in diameter than the passage to allow for the the first stage of welding said sections tousual rough and uneven surfaces and enable gether. Fig. 3 is a similar section showing the core to be easily and quickly inserted and 80 0 the pipe in an advanced stage, and Fig. 4illus* removed, and thus, as a result, after the weldtrates the pipe in its final or complete stage ing limited inward projections are formed, reof manufacture. ducing the passage-way to some extent. The In said drawings, a b are fixed and sliding objections to the use of a core have been such clamps or jaws for holding the pipe-sections. as that they have not been constantly em- 85 5 These are suitably supported upon but elecployed, and, as a result, the inward projectricallyinsulated from a suitable bed or frame tions have been greater and m ore detrimental c, on which the movable clamp slides. to the efficiency of the pipe.

(I is a handled screw having its hearings in By our process the metal is all turned outsaid frame 0 and adapted to move the clamp ward, and, without the use of a core, the pipe 0 b on the slideways of the said frame. Said is given a flowway of full capacity.

clamps a b are provided with jaw-sections a The process of welding the pipe-sections Z) for grasping the pipe'sections, which said A A together consists in first reaming out the jaw-sections are operated to bring the same ends of the pipes interiorly, as indicated at into grasping relation to the pipe by means h in Fig. 2, so that each of the pipe-sections 5 of hand-screws e e in any ordinary manner. will present an inward bevel or countersink, The clamps a 1) form the terminals of an and the sharp edges 2' of the extremities will electrical circuit, the wires g g of which are in lie in both sections, at the peripheries of the connection with a dynamo-electric machine pipes. I11 other words, the countersinking (not shown) of any suitable construction. or reaming is continued until the inward I00 The electrical fluid is conveyed to the pipebevel extends out to the periphery of the sections in the welding process through the pipe to form an angle in the section of the pipe presenting the hypotenuse and one side of a right-angled triangle, the least resistance being at the side opposite the hypotenuse or toward the periphery of the pipe, in which direction the moving metal will flow automatically, as will be understood. lVhen the sections are forced together by the movable clamp-jaw I), pressed forward by the handscrew (7, and meet at their peripheries, and when the dynamo-electrical current passes through the joint, the said metal at the point of contact will fuse and become soft or plastic because of the heat resulting from the imperfect conductivity at said joint and th us the pressure of the screw I) is continued.

llcretofore it has been a common practice to scarf the ends of the pipes oppositelyor to scarf one pipe exteriorly and the opposite pipe interiorly, so that one section will enter the other and thus produce quite a broad inclined surface of contact. By this construction, however, the outwardly-scarfed section, when pressure was brought to bear thereon while in its plastic condition, turned inwardly, so as to close up the passage through the pipe to a greater or less degree and reduce its flowage or supply capacity. In the present case, by the peculiar method employed. an increased strength is obtained at the joint by the outward flanging of the sections, as

shown, and the closing of the passage in the pipe or the reduction of the passage-way is prevented. After the operation of welding is completed the outwardly-flaring flanges at the joint in the pipe are rounded off by hammering to the shape shown in Fig. 4-, and in this condition the pipe is complete for the market.

Having thus described the invention, what we claim as new is The process of electrically welding metallic pipes which consists in interiorly reaming out both sections of the pipe, until the inward bevel extends to the periphery of the pipe, and thereby reducing outward resistance to end pressure, subjecting the reamed-ont extremities to end-to-end pressure and, at the same time, to an electrical current, and thereby softening the extremities and turn ing the same outward and thus welding the parts together, substantially as set forth.

In testimony that we claim the foregoing we have hereunto set our hands this 21st day of August, 1895.

ALBERT II. Mti'llAlALll. IRA O. MATATALL.

lVitnesses:

CHARLES H. PELL, O. B. PITNEY. 

